 Shortly after entering Carroll County, MD 30 curves northwest and meets the southern end of MD 30 Business (Hanover Pike) and Phillips Drive at a roundabout.While the business route heads north through the center of Hampstead, MD 30 passes to the west of the town on the Hampstead Bypass, which has two lanes but expands to a three- or four-lane divided highway for short stretches on either side of its roundabouts.The state highway passes under Houcksville Road and over Shiloh Road before meeting MD 482 (Hampstead–Mexico Road) at a roundabout.